£221 delivered, and with a 6% cashback from Quidco, making it £208 delivered for an excellent GN 58 flash, which means that it can illuminate an object at up to 190 feet away. Here is a good comparison of 58 AF-1 against Canon 580 EX II, which is about £328 on Amazon. http://www.shutterbug.com/equipmentreviews/accessories/0208canonspeed/http://www.ephotozine.com/article/Metz-58-AF1-12986
As you can see, Metz holds its own very well against a much more expensive Canon flash unit. Also, has some very positive reviews.
Best flash unit in Europe 2007/2008
Experts from 50 different trade journals from 18 European countries awarded this coveted prize to the Metz mecablitz 58 AF-1 digital in the Photo Accessories category. The innovative high-performance unit was the first flash equipped with a USB port. It can be used to conveniently update the specific firmware of each variation of the model via the computer and Internet.
Equipped with innovative developments, the Metz mecablitz 58 AF-1 digital provides state-of-the-art secondary reflector technology, high-performance power management, multi-zone AF measuring flash, and a fully swiveling reflector system. The new top Metz model transmits all camera specific system flash modes from Canon and Nikon including the respective wireless TTL mode. Due to its high guide number, the 58 AF-1 digital is not only especially powerful, but is also outstanding for bounce flash use. For its vertical as well as horizontal rotating and swiveling reflector, Metz integrated an extendible reflector card for the first time. Additional brilliance can be obtained for the close-up range via the integrated, system-controlled, secondary reflector for bounce flash.